Process of transferring liquefied gases from one container to another



April 1930. c. w. P. HEYLANDT 1,753,785

PROCESS OF TRANSFERRING LIQUEFIED GASES FROM ONE CONTAINER TO ANOTHER Filed March 8, 1929 INVENTOR; CT MFH Zz/zdz;

A TTORNEYS.

Patented Apr. 8, 1930 HEISSUED UNITED STATES PATENT OFFICE CHRISTIAN WILI-IELM PAUL HEYLANDT, OF BERLIN-LANKWITZ, GERMANY PROCESS OF TRANSFERRING- LIQUEFIED GASES FROM ONE CONTAINER TO ANOTHER Application filed March 8, 1929, Serial No. 345,259, and in Germany March 2, 1928.

In transferring liquefied gases of low-boiling. point from one vessel to another, and particularly when large quantities of such gaseswere involved, it has been the practice 5 heretofore to permit pressure to develop automatically from the natural evaporation of the gas in a closed vessel, in order to effect a sufliciently quick transfer of the liquefied gas. Under that method, however, considerable losses by evaporation occurred during the transfer of the gas into the second container. I have found that such losses can be reducedto one fourth if the gas is continuously maintained during storing and transportation at practically ordinary boiling temperature, and at the time of making the transfer, an artificial pressure gas is introduced into the first container for a definite length of time. This can be effected from an outside source, for instance by the use of compressed gas, or by the rapid evaporation of a part of the gas to be transferred or of an'otherliquid gas, and conducting the pressur'e'vaporsto the liquid. The liquid will then run out of the containers to be emptied at increased speed, without any substantial evaporation losses taking place.

Tests have shown that especiall during the transfer of pressureless liquefi d gases into pressure-developing containers, the losses which heretofore have amounted to from 2 to 4 per cent can be reduced by the present method to 0.5 to 1 per cent.

However,.also in other respects does the present method offer advantages, inasmuch as the transportation containers for liquefied gases now in use, the discharge openings of which containers, for practical reasons, are usually higher than the lowest liquid level, can be maintained in use, without pressure, and then, during the periods of rest, the pressure difference for the gas stored within the container is increased so that, during rest pe+- riods, no gas is lost from such transportation containers, while, when operating the vehicle, the increased gas pressure is immediately again reduced by utilizing the same in the motor so that the liquid to be transferred in accordance with the above-mentioned method again assumes the temperature of the boiling point.

In order to carry out the process, it is advisable to transfer a small quantity of the liquid gas into an evaporator coil, the evaporation products of which, with increased pressure, are led to the vapor or steam chamber of the receptacle which contains the liquid to be emptied.

. The drawing accompanying this specification illustrates diagrammatically an apparatus suitable for carrying out the present process.

In said drawing, 1 designates the inner container of a li uid tank having a filling pipe 3,'said tank eing mounted on a truck for elransportat-ion. At 2 this pipe 3 is tapped so t liquid contents can be drawn off into a coil '4, where it will evaporate. The coil dis coil 4.

Having thus described and ascertained the nature of my said invention, what I claim is gases from one container to another, which consists in maintaining the liquefied gases at their ordinary boiling temperatures in the first container, and utilizing a portion of the liquefied gases from the first container to appl an artificially increased momentary pressure to the liquefied gases thereby to cause the same to flow at increased speed into another container.

2. The process of transferrin liquefied gases from one container to anot er, which consists in maintaining thegases at their ordinary boiling temperatures in the first conat, as required, a small quantity of the 1. The process of transferring liquefied tainer, extracting a small quantity of said liquefied gases from said container and evaporating the same, and returning the vapors to said first container thereby to exert pres- 5 sure on the liquefied gases and cause the same to flow at increased speed into another con tainer.

3. An apparatus for transferring liquefied gases from one container to another, comprising a vessel having a filler tube, a coil disposed outside of said vessel and adapted to communicate at one end with said tube, the opposite end of said coil being in communication with said vessel above the liquid level, thereby to produce an excess pressure for discharging the liquid from said vessel. 4. An apparatus for transferring liquefied gases from one container to another, comprising a vessel having a filler tube, a coil disposed outside of said vessel and adapted to communicate at one end with said tube, the opposite end of said coil being in communication with said vessel above the liquid level, thereby to produce an excess pressure for discharging the liquid from said vessel, and detachable means for placing said vessel in communication with a second vessel.

In testimony whereof I have signed my name to this specification. CHRISTIAN WILHELM PAUL HEYLANDT. 

